gdb/ChangeLog:

	PR python/18089
	* python/py-prettyprint.c (print_children): Verify result of children
	iterator.  Provide better error message.
	* python/python-internal..h (gdbpy_print_python_errors_p): Declare.
	* python/python.c (gdbpy_print_python_errors_p): New function.

gdb/testsuite/ChangeLog:

	* gdb.python/py-bad-printers.c: New file.
	* gdb.python/py-bad-printers.py: New file.
	* gdb.python/py-bad-printers.exp: New file.